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Topic: Thermodynamics problem  (Read 4200 times)

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Offline labsent

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Thermodynamics problem
« on: October 21, 2011, 05:39:13 PM »
An ideal gas is enclosed in a cylinder. There is a movable piston on top of the cylinder. The piston has a mass of 8000g and area of 5cm2 and is free to slide up and down, keeping the pressure of the gas constant. How much work is done as the temperature of 0.2 moles of the gas is raised from 20 C degrees to 300 C degrees?

If the pressure is constant w= -Pex *  :delta:V and PV=nRT but I got stucked..
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Offline Schrödinger

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Re: Thermodynamics problem
« Reply #1 on: October 22, 2011, 01:50:47 AM »
Since n and P are constant, the other variables are T and V. So, as T increases, V also increases. Calculate that change in V and substitute it in the formula W= -Pex $$\Delta V /$$
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